\starttypescript[sans][SiyuanHei]
\definefontsynonym[syheiregular] [name:sourcehansanssc]
\definefontsynonym[syheibold] [name:sourcehansansscbold]
\stoptypescript

\starttypescript[sans][SiyuanHei]
\definefontsynonym[Sans] [syheiregular] [features=default]
\definefontsynonym[SansBold] [syheibold] [features=default]
\stoptypescript



\starttypescript[serif][SiyuanSong]
\definefontsynonym[sysongregular] [name:sourcehanserifsc]
\definefontsynonym[sysongbold] [name:sourcehanserifscbold]
\stoptypescript

\starttypescript[serif][SiyuanSong]
\definefontsynonym[Serif] [sysongregular] [features=default]
\definefontsynonym[SerifBold] [sysongbold] [features=default]
\stoptypescript



\starttypescript[siyuan]
\definetypeface[siyuan][rm][serif][SiyuanSong][default]
\definetypeface[siyuan][ss][sans][SiyuanHei][default]
\stoptypescript


\usetypescript[siyuan]
\setupbodyfont[siyuan,12pt]

\starttext


{\rm 人之初，性本善。性相近，习相远。\\
\bf 苟不教，性乃迁。教之道，贵以专。\\}
{\ss 人之初，性本善。性相近，习相远。\\
\bf 苟不教，性乃迁。教之道，贵以专。\\}


\stoptext